Chemical Vapor Corrosion; Water Piping; Power Supply; Installing The New Water Heater - A.O. Smith Gdhe 50 Instruction Manual

cheMIcal vapor corrosIon

CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY
OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN
CHEMICAL VAPORS. SUCH CORROSION MAY RESULT IN
FAILURE AND RISk OF ASPHYXIATION.
Spray can propellants, cleaning solvents, refrigerator and air
conditioning refrigerants, swimming pool chemicals, calcium
and sodium chloride (water softener salt), waxes, and process
chemicals are typical compounds which are potentially corrosive.
Do not store products of this sort near the heater. Also, air which is
brought in contact with the heater should not contain any of these
chemicals. If necessary, uncontaminated air should be obtained
from remote or outside sources. The limited warranty is voided
when failure of water heater is due to a corrosive atmosphere. (See
limited warranty for complete terms and conditions).

water pIpInG

HOTTER WATER CAN SCALD:
Water heaters are intended to produce hot water. Water heated to
a temperature which will satisfy space heating, clothes washing,
dish washing, cleaning and other sanitizing needs can scald and
permanently injure you upon contact. Some people are more likely
to be permanently injured by hot water than others. These include
the elderly, children, the physically or developmentally disabled.
If anyone using hot water fits into one of these groups or if there
is a local code or state law requiring a certain temperature water
at the hot water tap, then you must take special precautions. In
addition to using the lowest possible temperature setting that
satisfies your hot water needs, a means such as a mixing valve
should be used at the hot water taps used by these people or at
the water heater, see Figure 8. Valves for reducing point of use
temperature by mixing cold and hot water are also available:
Consult a Qualified Installer or Service Agency. Follow
manufacturer's instructions for installation of the valves.
Before changing the factory setting on the thermostat, read the
"Temperature Regulation" section in this manual.

InstallInG the new water heater

This water heater shall not be connected to any heating
systems or component(s) used with a non-potable water heating
appliance.
All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
Toxic chemicals, such as those used for boiler treatment shall
not be introduced into this system.
When the system requires water for space heating at temperatures
higher than required for domestic water purposes, a mixing valve
must be installed. Please refer to Figure 8 for suggested piping
arrangement.
The water supply pressure should not exceed 80 psi. If this occurs,
a pressure reducing valve with a bypass should be installed in
the cold water inlet line. This should be placed on the supply to
the entire house in order to maintain equal hot and cold water
pressures.

power supplY

The water heaters covered in this manual require a 120 VAC,
1Ø (single phase), 60Hz, 15 amp power supply and must also be
electrically grounded in accordance with local codes or, in the
absence of local codes, with the National Electrical Code, ANSI/
NFPA 70.
power fluctuatIons and electrIcal noIse
The water heater's control system requires a source of
stable clean electricity for proper operation. Connecting
the water heater to a branch circuit that is subject to
fluctuations in voltage level or electrical line noise such as
EMI (electro magnetic inter ference) or RFI (radio frequency
inter ference) may cause erratic control system operation
and malfunction.
A high quality power supply filter/suppressor such as the Kleen
Line model SELF/T-10 Series SC-L or equivalent must be
installed if the above conditions exist. Call the technical support
phone number listed on the back cover of this manual for more
information.
note: Malfunctions caused by the power supply and the costs
to install power supply filters are not covered under the limited
warranty.
dedIcated power wIrInG and breaKers
Dedicated power supply wires, ground wiring and dedicated
circuit breakers often prevent electrical line noise and should be
considered when installing the water heater.
polarItY sensItIve
The control system on the water heaters covered in this
manual is polarity sensitive; electronic flame sensing requires
correct polarity. The control system is programmed to monitor
the incoming power supply. If the Hot and Neutral wires in
the 120 VAC power supply are reversed, the control system
will declare a Fault condition and lock out, heating operation
will be disabled until the power supply is correctly wired. The
control system will display the "AC Reversed" Fault message
on the LCD.
14